The FBI is saying it was a probable suicide event. They have had his website contents removed. However, there is a link on it to the diatribe he wrote on it just this morning before setting his house on fire and heading to the airport. Pilot's name is Joseph Andrew Stack.
www.EmbeddedArt.com gives the link to his 'suicide' msg.
p.s. - I tuned into the Austin tower feed shortly after I heard the news. I heard this little exchange -
Approaching aircraft: 'Is that smoke from a house fire or a plane crash?'
Tower: 'One and the same'.